Uplink multi-user multiple-input and multiple-output (UL MU-MIMO) transmission request method in UL MU-MIMO communication

Abstract

Provided is a method of transmitting and receiving a frame for a multi-user multiple-input and multiple-output (MU-MIMO) communication in an access point (AP), the method including transmitting, to each of a plurality of stations (STAs), an uplink multi-user request (UL MU request) frame requesting transmission of a data frame, and receiving, from each of the plurality of STAs, the data frame during an identical period of time based on an identical reception intensity, wherein the UL MU request frame includes at least one of information on a transmission time of the data frame and information on a reception intensity of the data frame in the AP.

What is claimed is: 
     
       1. A method of transmitting and receiving a frame for a multi-user multiple-input and multiple-output (MU-MIMO) communication in an access point (AP), the method comprising:
 transmitting, to each of a plurality of stations (STAs), an uplink multi-user request (UL MU request) frame requesting transmission of a data frame; and 
 receiving, from each of the plurality of STAs, the data frame based on an identical reception intensity, 
 wherein the UL MU request frame comprises a Tx power field and a Requested Rx power field, the Requested Rx power field including information on a reception intensity requested when the AP receives the data frame, and 
 wherein transmission intensity of the data frame is determined based on the Requested Rx power field and path loss by each of the plurality of STAs. 
 
     
     
       2. The method of  claim 1 ,
 wherein the Tx power field includes information on a transmission intensity of the UL MU request frame applied when the AP transmits the UL MU request frame. 
 
     
     
       3. The method of  claim 2 ,
 wherein the path loss is calculated based on an actual reception intensity of the UL MU request frame and the information on the transmission intensity of the UL MU request frame included in the Tx power field. 
 
     
     
       4. The method of  claim 1 ,
 wherein the data frame is received during an identical period of time from each of the plurality of STAs. 
 
     
     
       5. The method of  claim 1 , wherein the UL MU request frame comprises identification information on each of the plurality of STAs. 
     
     
       6. The method of  claim 5 , wherein the identification information comprises at least one of media access control (MAC) address information, association identification (AID) information, and partial AID information in the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac. 
     
     
       7. The method of  claim 1 , wherein the UL MU request frame further comprises information on a number of transmission STAs. 
     
     
       8. A method of transmitting and receiving a frame for a multi-user multiple-input and multiple-output (MU-MIMO) communication in a station (STA), the method comprising:
 receiving, from an access point (AP), an uplink multi-user request (UL MU request) frame requesting transmission of a data frame; 
 determining a transmission intensity based on the UL MU request frame; and 
 transmitting, to the AP, the data frame based on the determined transmission intensity, 
 wherein the UL MU request frame comprises a Tx power field and a Requested Rx power field, the Requested Rx power field including information on a reception intensity requested when the AP receives the data frame, and 
 wherein the transmission intensity of the data frame is determined based on the Requested Rx power field and path loss. 
 
     
     
       9. The method of  claim 8 , wherein the Tx power field includes information on a transmission intensity of the UL MU request frame applied when the AP transmits the UL MU request frame. 
     
     
       10. The method of  claim 9 ,
 wherein the path loss is calculated based on an actual reception intensity of the UL MU request frame and the information on the transmission intensity of the UL MU request frame included in the Tx power field. 
 
     
     
       11. The method of  claim 8 ,
 wherein the AP receives the data frame during an identical period of time from each of a plurality of STAs. 
 
     
     
       12. The method of  claim 8 , wherein the UL MU request frame comprises identification information on the STA. 
     
     
       13. The method of  claim 12 , wherein the identification information comprises at least one of media access control (MAC) address information, association identification (AID) information, and partial AID information in the Institute of Electrical and Electronics Engineers (IEEE) 802.11ac. 
     
     
       14. An Access Point (AP) for use in a multi-user multiple-input and multiple-output (MU-MIMO) communication, the AP comprising:
 a communicator; 
 a controller configured to control the communicator; 
 wherein the controller is further configured to: 
 cause the communicator to transmit, to each of a plurality of stations (STAs), an uplink multi-user request (UL MU request) frame requesting transmission of a data frame, 
 cause the communicator to receive, from each of the plurality of STAs, the data frame based on an identical reception intensity, 
 wherein the UL MU request frame comprises a Tx power field and a Requested Rx power field, the Requested Rx power field including information on a reception intensity requested when the AP receives the data frame, and 
 wherein transmission intensity of the data frame is determined based on the Requested Rx power field and path loss by each of the plurality of STAs.